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A124117
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a(n) the smallest composite number of n+1 digits that becomes a prime by incrementing any one of the higher order digits.
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0
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21, 129, 1003, 10681, 101829, 1020831, 10251129, 100780743, 1051460221, 10153541853, 103257526729, 1483112006019
(list; graph; refs; listen; history; internal format)
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